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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0730d4a8dc8eb2f7f08fe1b160101c8ec7f64ed603bae6b9ec00d9be9a1103' 
  AND token = '8OEzmpAP68CNB24ioHPB+Cmk+TOtyawxZspWq6BlGr4=' 
  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"
    }
  }
}