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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5ed2273856dca362aff38b6a1a3a86e98125702b891e27ae48acb8c1cdeeaf' 
  AND token = '8B0zSKRB8vek3ZWvWryzKFA2UkQzqGxRDtx7fHOSu/I=' 
  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"
    }
  }
}