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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4329d9a45c9549e76800065aa78bcd7939154991279aad761e2bbb273b2ad60c' 
  AND token = 'VsUeJm2veTz0GOHeljpvPmxkQP+/XRpFDY9v11oIlxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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