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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e796fbb8fa1c6fd252f53405e046c63ded4f5fcf8de47c44fb31e4c311154c47' 
  AND token = 'foVUvFm6W+4QdBsOekDe45TPuMQ0dOsYSS/fddWo+Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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