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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5338a0b80da0b22a8ddcfc8db40d1f42d528f4cae4e72d9e8feced1ebce550' 
  AND token = 'F8qyWBAfm116aH11jbOECof2g9Iq6mQZ4HPhihJ3guo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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