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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee755ffa2f5c459fc248f3657c8c5f09c50fe6c10e0bc6a6d2d9e7e09afdb60' 
  AND token = 'oKWwI5qGthjPFi+NtB/EaHgF8ZeS7XU++YXqRwFaeWU=' 
  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"
    }
  }
}