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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1331b51bd7a5218b40507d0b020b366edc340260db435e0d6857633895c0a0a6' 
  AND token = 'aWbXJRwIBbkooWhYA4oLgHcK1eFPm9l7oB1lSU7/SeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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