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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c244347c64cb893df7b63a765d39f839428e1e454188dedb027be0f7811a786' 
  AND token = '0y6EDMXwEa9Q6mMKjmNLDvg0GAxt1bnLzM8m/pNPJMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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