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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbe9bc90a7ad9e5bed8f61f73b938d5d446cbce74a6496f2f39ca9f24fcaae0' 
  AND token = 'ggSNB1029d5aVq92YxhsRwu+Fmvvd3Wz8oI9j/ayp5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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