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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb5eb9d6610758d7c880616334a15b4e67048ce87e05173892c2a546351f668' 
  AND token = '37D0qc+nTGwv9P8ZcTlxixtYfdxB+7xFL8re1BJmJr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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