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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a964882f5848a9d2ae68c8e4141314e361d08550c767e2f8b0fbdec98b1e6f' 
  AND token = 'QT4doZOs/VQpyP7Rb2h0B2E9JNxw3apwEVU8W/X1L+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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