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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4882a2822797a4a60979c3df8898d7e6b8e90c8e0136e14b9ea0e0d4f651dc6f' 
  AND token = 'Vkk7bf30QdV6H1cTPD2c2vCAVR6a6YJGYxTUZo20M2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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