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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f6d80d6ddbc5ee09f021db2c8ff155a91ff25494151b7eacfc0753dd9b6f0d' 
  AND token = 'WDQC8o3am2A4nBGq1rhxzKmR7kfMdmpirujfEv/9NBU=' 
  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"
    }
  }
}