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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbdcea454d4eea17f11c3e8f40993cfb7f203d3c25a82e2aedd57fc81d8b7dc' 
  AND token = '0nN0G/zj4h2pDMrOwau2k8y3JprCRJTDF7FHxSRFLr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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