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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26360198a42c339d66055f9679196589e3a0301db1a94acfe1f4ff6bc2bdbc61' 
  AND token = 'PAVUGncKpBye/5gXPPXAhv38iybxFW+Eoln0DSlfrU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}