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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56165e1f92436a4bda645937a469cd063e28a09c5eb23c8da38fc54a1d01faed' 
  AND token = 'zC0F7R9AKS7RwjbBFjntTq8MNwAiZYNQBRE2ivi8k1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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