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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf828aa1e929c7270efb7e8e0612563862fe82091500c73d7b1dc7e7e3b83c71' 
  AND token = 'KJjX9EJibS28nvlqSoyvVTIJwC8U3rrLAb6hEgCDCMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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