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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42413857b8b3fd72d3f64caaccad28eae881f0c963bf8b9ad2aa0bcf3469a121' 
  AND token = 'sJ9T6VAN/PmxL+5I0/6SrRjSVYpk6H8ovO5Le0v0uBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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