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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4fce88c7e9c00dab5b35043a82bbe253bc3cf9dc70c5c3be672bd26a4f4738' 
  AND token = 'QnzwHLlHPELHhusKdC726EPiR1noP/oSKyVpX1fhRXM=' 
  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"
    }
  }
}