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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579b0350e01372ee40df04569f49ba92665dccc7a895a3886c517ea93417b5ad' 
  AND token = 'f5Byfki42N0eCkapGuLoNOyBQ7UCgCqEyzzpYF0+dd4=' 
  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"
    }
  }
}