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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7360e92b602190ab471df2ee8e848fb62c4ad78fbb9339bb4ec47137d3ffc2f7' 
  AND token = 'KZO1VnbWPgpHJJD1Ml7movmSDGO2pcecottx2N0pkMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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