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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ea0ded5282f1e1923b1eaf81a1b93da287fa5a85b6a242c51f362d0d34b468' 
  AND token = 'J+7a3IjihP2kje6fT9TY96l22Owr13VoyGE4V4jrkL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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