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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c028e10f5a74303103bb1e323d9e359532ef7d7f239bc75ae95c69ddf0eac65' 
  AND token = '4KBRg4Yp/LP1wa8iTw+5+OmlYed8JApdfTaZY5Jb8ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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