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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b922fb912339bddf8c9542ecd83722f4d0257b022efda65b6c39819a64b0b25' 
  AND token = 'ZEtOP0YhyS3F4bhRm3k5uysyyERN54EellgihAK/8f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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