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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa53a0b70b55aad7b2f1f75a0368bdd962b408d6dd44f2436de7a1b7cb05b2ac' 
  AND token = '/TGqEEjEgDjpPbB29/rSexziFjGAgpvAHFq91d7o/0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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