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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cfb5d7eb82076da79247fd1b09f8d3a4591e106644b47375c1ce676c1ee095' 
  AND token = 'iICY1l9w8adatxcBK0Z/IeKbwJXKUd8AFQm32Gxyyuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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