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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40beaa3e2d4bbe7f12991ef10013e79e4a27fdb41a4b2b1ac1e8ac92dbebdb5' 
  AND token = '2z7AIndXCOyE93mZZvcjkscNI2legMreFrDoKCHceUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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