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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af6ced8aad7c074bb801eb7359cc953c019e52c24e22a17d97790e9442ecdb8' 
  AND token = 'B3M7IiGRbU9u3UGEWx3XD1MzkAnkZv5ZMsR2aXArPyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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