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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93452c86e2f3d7654c221058c215ba35bf59d0ffca54716121ed89c934481a42' 
  AND token = '89t7epUtnrzyl5oysaMUslVp1p3v0lLq2l9B4kVuW1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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