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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9344855b317578b6367c68041f9b4a5fa7d4cb76640b4ca832b99cb998e3ab5b' 
  AND token = 'aBbYiOmPIma5k1AAUS4Oa/bSNzoRKjxtUeIot63noO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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