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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05589fc45cc37d3c520ecd28dd281d20d18d3e0074d30bd52a81a1dfe1a66fc0' 
  AND token = 'aAa4v5oUQ19e9hnaIqEq1q4hh7ZgBOE/8uH+hMi0rzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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