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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac6e96cdcc02aa71ca0601e59380b520236d87d1b6fd31ea8c5a8f8239ef652' 
  AND token = 'jO5dCAmpXEdbeS0OjEqHWTgq2Ihen5U84/bObujbyPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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