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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d2463f3380254c87de6e637cd67447a9043a79817cf46029132057d28d3f6c' 
  AND token = 'iLC4Rxu6TPnlBEc8i7bJV8ZUrqzln7HD4bqsrdIiiys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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