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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f5af1789e544a1bcf02e4dbd9f3fd9e343f351aced0394c61727a7c4c92598' 
  AND token = '95x1cqERBKjI1P5vvFN90XL8p6AgHCrPXQaXKqRn1uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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