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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416e3874434e26cd1e852f1f9b866ab9a81e62daae86eb9b8d3358191e1f414e' 
  AND token = 'ueOtLIYI4lVUpxP4DP2MD0a547fxE0uRKfU7dhjtraM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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