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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '580001e253a3e4c7c1ec3699587a95cd3c24e5d2f9874e8f58c59821f997a0d0' 
  AND token = 'AulBcyvNXkgRw6sDYmMOhchPLMtIx4uznL4HX3zD1to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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