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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3786778b8bd024abc662caaf33570cceea3aa053b449531d82644877ebb7d6' 
  AND token = '5ueRY74Jz0IHYammLwS749ffZY9PYsFz8+x5rJ9FaEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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